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Sorry I should have been more explicit about the 20-25K number. Essentially we have very high confidence in our ability to estimate down to the 20 to25k range. This takes you roughly down to the 100,000th site as ranked by UVs. Beyond this we have reasonable confidence in our estimates down to the millionth site which gets roughly 1,000 UVs per month. There will be a bit more volatility in the numbers from 20k down to 1k in terms of UV estimates but for the majority of those site we feel directionally confident. On a monthly basis we actually recieve data on something closer to 6 million domains. I hope this helps clarify a bit.

Keep your eyes on Compete Will. We will be rolling out some small examples of trended data in our next release and then will be adding some full blown trended tools at the keyword level shortly after that this year.

Absolutely ... the joy of working in the web space is that we get to complain about the flaws in the data we have access to. When you think about this, it is truly a luxury. We expect a lot in our world. Most advertisers in traditional media would kill for the equivalent level of data offline. Think about how much weight goes into Nielsen TV ratings. You want to talk about a flawed sytem of data...

We have regular checks in place to identify the same user showing up through multiple sources. It's actually fairly simple to identify since we have timestamaps and URL streams. When we see a datafeed that is identical coming from two different data sources we can remove one from the final dataset so we don't double count.